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At Siggraph 1999 (LA) I was discussing a display idea with Virtual Research.
Both of us thought this idea is "obvious" in the patent sense.
I put this in the public domain:
take the backlight off an LCD screen, perhaps replacing it with a
transmissive piece of plastic
as a contrast filter - and - you have an AR display.
Stereo can be done using LCD shutter glasses and tracking the user,
screen, and object(s)
Anybody done this yet?
... bandit (pacificVR.com)
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From:

"Alessandra Canesi" <acanesi@a .....>

Received:

Jun 15, 2001

To

"FORUM ON AUGMENTED AND VIRTUAL REALITY" <ARforum@l ..........>

Subject:

Re: [ARforum] an obvious AR display

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Hi bandit,
we are doing some research in the augmented reality field (medical application),
and some times ago we had to find an augmented reality display system to be used
for our application. We thought about using an LCD display in the way you
suggested, but it seemed to us that there are no LCD displays whose refresh rate
allows to see stereo images: do you know if such an LCD display exists?
Thank you
Alessandra
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This is in response to 2 postings:
Refresh rate:
The best LCD referesh out there is about 76 HZ
However, most drivers buffer up the odd/even scan lines and dump the
whole image out.
So the effective rate (as I understand it) is 38 HZ
I then assume this is divided by 2 for the left/right, = 19 Hz
So there would be a flicker
Transparent LCD:
ALL LCDs are transparent. Just take off the backlight.
The problems with the LCD are that the tracking/math is more involved
(but not too bad)
and a boom of some sort is manditory, otherwise the users arms will fall
off,
something most users will object to. A fixed frame is just a simple boom,
but might be applicable to some apps, ie PCB assembly.
A camera-thru HMD needs more calibration (for correcting the optics)
and has the issue of focal length.
I was at the SID show last week.
A startup has taken two LCDs, stripped the backlight off one,
overlayed it on the other, and came up with an effective 3D display.
It takes a fair amount of math from some russian phds, but it is effective.
Check out NeurOK: 3d.neurok.com
703-243-9704
The bottom line, of course, is there is no optimal solution yet.
PS: there is a SF book "Noir" where the character has had his optic
nerves hacked so that the
world has an overlay of 1920 detective motif - its an interesting read.
Cannot remember the author
... bandit
Yohan Baillot wrote:
>
>
> Dear Bandit
>
> I would like to do it but I cannot find a transparent LCD display and I dont
> really
> want to get into the hardware to achieve that. Also, using a camera fixed
> to the screen to replace your eye is actually simpler to put together as you
> dont have to track the transformation between the screen and your eyes.
>
> I think the Arvika project team have been working on such a device.
>
> Yohan
>
> _______________________________________________________________________
>
> Yohan BAILLOT
> Electrical and Computer Engineer
>
> Virtual Reality Laboratory,
> Advanced Information Technology (Code 5580),
> Naval Research Laboratory,
> 4555 Overlook Avenue SW,
> Washington, DC 20375-5337
> baillot@a ...............
> (202) 404 7801
>
> Home : (703) 566 3684
> Cell : (703) 732 5679
> Fax : (202) 767 1122
> Web : www.ait.nrl.navy.mil/people/baillot
> Project BARS: http://ait.nrl.navy.mil/vrlab/projects/BARS/BARS.html
> _______________________________________________________________________
>
>
> | -----Original Message-----
> | From: bandit [mailto:bandit@c .........]
> | Sent: Thursday, June 14, 2001 11:50 PM
> | To: ARforum@l ..........
> | Subject: [ARforum] an obvious AR display
> |
> |
> | FORUM ON AUGMENTED AND VIRTUAL REALITY
> |
> | --------------------------- ListBot Sponsor --------------------------
> | Get a low APR NextCard Visa in 30 seconds!
> | 1. Fill in the brief application
> | 2. Receive approval decision within 30 seconds
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> | annual fee!
> | Apply NOW!
> | http://www.bcentral.com/listbot/NextCard
> | ----------------------------------------------------------------------
> |
> | At Siggraph 1999 (LA) I was discussing a display idea with
> | Virtual Research.
> | Both of us thought this idea is "obvious" in the patent sense.
> | I put this in the public domain:
> |
> | take the backlight off an LCD screen, perhaps replacing it with a
> | transmissive piece of plastic
> | as a contrast filter - and - you have an AR display.
> | Stereo can be done using LCD shutter glasses and tracking the user,
> | screen, and object(s)
> |
> | Anybody done this yet?
> |
> |
> | ... bandit (pacificVR.com)
> |
> |
> | ______________________________________________________________________
> | To unsubscribe, write to ARforum-unsubscribe@l ..........
> |
>
>
> ______________________________________________________________________
> To unsubscribe, write to ARforum-unsubscribe@l ..........
>
>
>
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